.box{
    border-radius: 10px;
    border: 1px solid #000;
    padding: 10px;
    margin: 10px;
    width: 100px;
    height: 100px;
    color: #fff;
    font-size: 16px;
    font-weight: bold;
    color: #000;
}

.red{
    color: #f00;
}